4G LTE/LTE-Advanced for Mobile Broadband by Erik Dahlman, Stefan Parkvall, Johan Sköld PDF

By Erik Dahlman, Stefan Parkvall, Johan Sköld

Achieve perception into 3GPP’s most up-to-date regular free up eleven on LTE/LTE complicated and the way unencumber 12 is developing

To flow to higher-speed networks that could cater to client call for for cellular broadband multimedia functions, the 3GPP has constructed the newest LTE-Advanced (LTE unlock 10) average, with a purpose to be mounted in December 2010. This ebook specializes in LTE and LTE-Advanced, and offers engineers with actual perception and knowing into the why and the way of the normal and its comparable applied sciences. This booklet is written via engineers from Ericsson--the world's top telecommunications supplier--who was once seriously inquisitive about the advance of the normal.

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Mobile-communication systems should preferably be designed to be able to take advantage of such scenarios – that is, they should be able to offer very high data rates within a limited bandwidth when the radio conditions so allow. A straightforward means to provide higher data rates within a given transmission bandwidth is the use of higher-order modulation, implying that the modulation alphabet is extended to include additional signaling alternatives and thus allowing for more bits of information to be communicated per modulation symbol.

A second drawback of multi-carrier transmission is that, similar to the use of higher-order modulation, the parallel transmission of multiple carriers will lead to larger variations in the instantaneous transmit power. Thus, similar to the use of higher-order modulation, multi-carrier transmission will have a negative impact on the transmitter power-amplifier efficiency, implying increased transmitter power consumption and increased power-amplifier cost. Alternatively, the average transmit power must be reduced, implying a reduced range for a given data rate.

11. This is often expressed as a one-tap equalizer being applied to each received subcarrier. 11). To be able to do this, the receiver obviously needs an estimate of the frequency-domain channel taps H 0 , …, H N c Ϫ1. The frequency-domain channel taps can be estimated indirectly by first estimating the channel impulse response and, from that, calculating an estimate of Hk. However, a more straightforward approach is to estimate the frequency-domain channel taps directly. 12. Using knowledge about the reference symbols, the receiver can estimate the frequency-domain channel around the location of the reference symbol.

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